Sender reputation is calculated continuously based on sending history, authentication integrity, spam complaint frequency, and spam trap collisions.
1. Essential Reputation Monitoring Platforms
- Google Postmaster Tools (GPT): Provides IP reputation, domain reputation, user complaint rate, SPF/DKIM/DMARC success rates, and delivery error rates directly from Google's infrastructure.
- Microsoft Smart Network Data Services (SNDS): Real-time insight into Outlook.com recipient traffic, spam trap hits, and filter disposition.
- Talos Intelligence (Cisco): Global IP and domain threat scoring used by enterprise email gateway appliances.